Moisture and humidity are critical for testing many materials. Q-Sun models are available with water spray and control of relative humidity.

Humidity Control
Many models of the Q-Sun are available with relative humidity control. Humidity can affect degradation when the material becomes physically stressed while attempting to maintain moisture equilibrium with its surroundings. Relative humidity also influences the rate at which a specimen dries.

Water Spray
The damaging effects of outdoor moisture attack are simulated by direct, pure water spray. The spray can be programmed to operate during either the light or dark periods. In addition to oxygenation, spray can be useful for creating thermal shock and/or mechanical erosion.

Acid Rain Simulation Using Dual Spray
To address the problem of acid etch on automotive clear coats, BASF and Q-Lab developed a new test procedure called the BASF Accelerated Acid Test (Q-Sun BAAT) that utilizes the Q-Sun Xe-3-HDS (dual spray) and an acid rain solution.

Supported by years of research, the Q-Sun BAAT test is the only proven effective acid rain test available. This test has been shown to produce excellent correlation to outdoor results in as little as 400 hours of laboratory testing. For more information about the Q-Sun BAAT test, please refer to technical bulletin LX-5025.